A cavity-based optical antenna for color centers in diamond

Abstract

An efficient atom-photon-interface is a key requirement for the integration of solid-state emitters such as color centers in diamond into quantum technology applications. Just like other solid state emitters, however, their emission into free space is severely limited due to the high refractive index of the bulk host crystal. In this work, we present a planar optical antenna based on two silver mirrors coated on a thin single crystal diamond membrane, forming a planar Fabry-Pérot cavity that improves the photon extraction from single tin vacancy (SnV) centers as well as their coupling to an excitation laser. Upon numerical optimization of the structure, we find theoretical enhancements in the collectible photon rate by a factor of 60 as compared to the bulk case. As a proof-of-principle demonstration, we fabricate single crystal diamond membranes with sub-$\mu$m thickness and create SnV centers by ion implantation. Employing off-resonant excitation, we show a 6-fold enhancement of the collectible photon rate, yielding up to half a million photons per second from a single SnV center. At the same time, we observe a significant reduction of the required excitation power in accordance with theory, demonstrating the functionality of the cavity as an optical antenna. Due to its planar design, the antenna simultaneously provides similar enhancements for a large number of emitters inside the membrane. Furthermore, the monolithic structure provides high mechanical stability and straightforwardly enables operation under cryogenic conditions as required in most spin-photon interface implementations.

The following article contains 31 pages and 6 figures and has been submitted to APL Photonics

References in corpus (14)

• Silicon-Vacancy Spin Qubit in Diamond: A Quantum Memory Exceeding 10 ms with Single-Shot State Readout
• Tin-Vacancy Quantum Emitters in Diamond
• All-optical initialization, readout, and coherent preparation of single silicon-vacancy spins in diamond
• Strongly enhanced photon collection from diamond defect centres under micro-fabricated integrated solid immersion lenses
• Photophysics of single silicon vacancy centers in diamond: implications for single photon emission
• Cavity quantum electrodynamics with color centers in diamond
• All-optical control of the silicon-vacancy spin in diamond at millikelvin temperatures
• Nano-fabricated solid immersion lenses registered to single emitters in diamond
• Single-photon-emitting optical centers in diamond fabricated upon Sn implantation
• Cavity-enhanced single photon source based on the silicon vacancy center in diamond
• Coupling of a Single Tin-vacancy Center to a Photonic Crystal Cavity in Diamond
• Coherence properties and quantum control of silicon vacancy color centers in diamond
• A low-loss, broadband antenna for efficient photon collection from a coherent spin in diamond
• Highly efficient light extraction and directional emission from diamond color centers using planar Yagi-Uda antennas